Electricity-meter.



Gi HOOKHAM.

ELEGTBIGITY METER.

APPLICATION FILED JULY 1a, 1908.

925,187. Patented June 15, 1909.

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mine-n GEORGE IIOOKIIAM, OF BIRMINGHAM, ENGLAND.

ELE CTRICITY-ME TE B To all whom it may concern:

Be it known that I, GEORGE Hooxiniir, a subject of the King of Great Britain and Ireland, and residing at Solar l i orks, New Bartholomew street, Birmingham, in the county of il arwicli, England, have invented certain new and useful Improvements in Electricity-Meters, of which the following is a specification.

This invention relates to electricity motor meters in which an armature revolves in a mercury bath. In such meters it is customary to seal up the mercury chamber while the meters are in transit to prevent loss of mercury. This is effected by means of a tube surrounding the armature spindle and so arranged that it may be extended telescopically until its upper edge bears against a valve seating carried y the armature spin die. In manipulating this valve I have found that the air necessarily included in the extended upper portion of the tube is liable to get transferred to the armature chamber and prevent regular and uniform working of the meter.

T he object of the present invention is to overcome this disadvantage.

The invention consists in providing an add itional space for mercury forming part of or in connection with the main mercury bath and so arranged that the mercury may be forced out of it as the telescoping tube extends so that the tube is kept always full of mercury until it meets the valve seat forming the seal.

The invention is shown in the accomp anying drawings, in which z- Figure 1 is a vertical sectional view, and Fig. is a central vertical section through the meter.

In Fig. l I provide a passage, (0, in the upper wall of the mercury chamber, 1). A. plunger, 0, works in the assage a, and is connected by a link, (Z, wit 1 the outer end of a lever, c, pivoted at, f, the inner end of the lever, 0, being pivoted to the arm, 9, pivoted at i by which the telescoping tube 72. is raised and lowered. The raising of the arm is effected by the spring, 76, which holds the arm and the tube, h, against the soft washer, j, on the armature spindle, Z. The arm, 9, is moved downward to free the spindle by means of the rod, m, operated by the screw, it.

It will be seen that in the above described arrangement, when the telescoping tube, h, is

Specification of Letters ?a.tent.

Application filed July 18,

Patented June 15, 1909.

1908. Serial No. 4%,205.

' raised the plunger, 0, is correspondingly l lowered into the mercury chamber and the area of the passage, 8, is such that the mercury displaced from the main mercury chamher is just suflicient to fill the increased space due to the raising of the tube.

If desired, instead of providing a plunger as above described the wall of the additional space may be made collapsible, for instance, the tube 0 might be replaced by a rubber tube which collapses as the tube It moves upward.

It will be seen that other forms of seal may be used than that above described.

Having now described my invention. what I claim as new and desire to secure by Letters Patent is 1. In an electricity motor meter, in combi nation, a mercury chamber, an armature mounted therein, an auxiliary chamber in communication with said. mercury chamber and means fol-forcingmercuryfrom said auxiliary chamber.

2. In an electricity motor meter, in combination, a mercury chamber, an armature mounted therein, a spindle carrying said armature, an auxiliary chamber in communica tion with said mercury chamber, means for sealing said mercury chamber, and means for forcing mercury from said auxiliary chamber into said mercury chamber.

3. In an electricity motor meter, in combi nation, a mercury chamber, an armature mounted therein, a spindle carrying said. armature, means for lifting said spindle, an auxiliary chamber in communication with said mercury chamber, and means for forcing mercury from said auxiliary chamber when said spindle is lifted.

4. In an electricity motor meter, in combination, a mercury chamber, an armature mounted therein, a spindle carrying said armature, a telescopic tube forming with said spindle a mercury seal, an auxiliary chamber in communication with said mercury chamber, a piston working in said auxiliary cham her, and means actuating said mercury seal and said piston, as and for the purposes described.

In testimony whereof, I ail-ix my signature in presence of two witnesses.

GEORGE HOOKIIAM.

Witnesses ARTHUR BERNARD FISHER, WILLIAM VVORTON. 

